ETH is at a peak right now, so idk if it'll continue to climb, or go back down some, so u might wanna go with BTC, as it is in a slump, right now...if ur wanting to wait for a slump in TRX to buy in, then ETH might not be the best option (unless u already have some).

I would just keep an eye on TRX for the next 24 hours...I think it'll go back down to, at least, .0000043ish tonight...don't bank on that, but my (personal) prediction seems to match the current trends that TRX has been following the past few weeks.

If it drops to the low 400s, then I would snatch it up again, so long as it isn't in a free fall.